2012 London Olympics

August 11, 2012 |Photos by Smiley N. Pool / Houston Chronicle

Smiley N. Pool/Houston Chronicle

97of248

Kerron Clement of the USA, right, Britain's David Greene,center, and Mamadou Kasse Hanne of Senegal react after competing in a men's 400-meter hurdles semifinal at the 2012 London Olympics on Saturday, Aug. 4, 2012.

Smiley N. Pool/Houston Chronicle

97of248

Kerron Clement of the USA, right, Britain's David Greene,center, and Mamadou Kasse Hanne of Senegal react after competing in a men's 400-meter hurdles semifinal at the 2012 London Olympics on Saturday, Aug. 4, 2012.